diff --git a/src/global.h b/src/global.h
new file mode 100644
index 0000000..e827bcb
--- /dev/null
+++ b/src/global.h
@@ -0,0 +1,24 @@
+/**
+ ********************************************************************************
+ * @file    global.h
+ * @brief   Defines global constants and types used in the assembler and emulator.
+ ********************************************************************************
+ */
+
+#ifndef GLOBAL_H
+#define GLOBAL_H
+#include <stdint.h>
+
+// Number of General Purpose Registers.
+#define REGISTER_COUNT 31
+// Size of the memory in bytes.
+#define MEMORY_SIZE 2097152
+// Length of the memory address in bits. 
+#define MEMORY_ADDRESS_LENGTH 21
+// Length of the instruction in bits.
+#define INSTRUCTION_SIZE 32
+
+// Define the word type to be a 64-bit unsigned integer.
+typedef uint64_t word;
+
+#endif
\ No newline at end of file